Three problems related to engine burning oil have been reported for the 2008 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 GMC Sierra 1500 based on all problems reported for the 2008 Sierra 1500.
My sierra developed a noise on deceleration. Took it to the GMC dealer and was told it had a worn cam. $5500 to repair, $7750 to replace engine. I knew that a worn cam would cause lifter noise all the time so that was wrong info. Upon further investigation I found out this truck has active fuel management. What happened was a failure of the system. It should be noted that this truck always had high oil consumption. I deactivated the active fuel management system. The truck runs on all 8 cylinders, is completely quiet and no longer uses oil. It is better than new. I also found hundreds of complaints similar to my and paid for expensive repairs. This active fuel management is nothing more than a scam to falsely increase fuel mileage and to rip off customers when it goes bad. It can be deactivated with a $175 chip.
Low oil pressure light came on due to excessive oil consumption while driving. Engine burned 5 quarts of oil in under 3000 miles. 105k miles on 5. 3 liter v8. Dealer said typical for this engine to have carbon buildup and needs new piston rings and pistons. Also driver side door lock actuator replaced and window switches.
Excessive oil consumption. Began using in June of 2015. Uses more than 1 qt per 3000 miles of driving.